If you don't like how the mr1 stock sucks and the dogleg looks tacky, then get the rap4 air-through stock. It is adjustable and is perfect for running an air-through system. They even sell the stock with an M16 16" barrel for only $110 or something like that. It is a great buy!. The 16" shoots great and the stock goes in where your spring goes. It feels a lot better. :D